- Cadem
- Callum Scott
- Carly Rae Jepsen
- Carly Simon
- Carole King
- Carpenters
- Carrie Underwood
- Cascada
- Cee Lo Green
- Celine Dion
- Charlene Soraia
- Charlie Puth
- Cher
- Cher Lloyd
- Cheryl Cole
- Chicago
- China Anne McCormack
- Chris Daughtry
- Christina Aguilera
- Christina Perri
- Ciara
- Cindy Lauper
- Clay Aiken
- Clean Bandit
- Colbie Caillat
- Coldplay
- Common Linnets
- Connie Francis
- Corrs,The
- Creed
- Creedence Clearwater Revival
- Crew Cuts